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优化制粒是烧结生产中提高产量和质量,降低能耗的重要措施。水分控制是制粒生产中的重要环节,它影响到制粒颗粒的强度和粒度组成,决定了生料层的透气性。为提高制粒生产中加水量的控制水平,文章对湿容量在铁矿石烧结生产中的应用作了相关研究。物料湿容量是指单位质量的烘干物料在一定温度和压力下所能容纳的最大含水量。实验室试验及工业试验表明:①物料的吸水过程规律显著,湿容量是物料重要的吸水特性参数;②湿容量与物料制粒的适宜含水量成线性关系,相关系数R=93.1%;③可通过物料的CaO、Al2O3、MgO、<0.2mm的粒级含量及0.2～0.7mm的粒级含量等理化指标来预测湿容量。为提高湿容量的预测效果,比表面积、孔隙率、接触角等物性参数的影响也必须加以考虑。
Optimized granulation is an important measure to increase yield and quality in sinter production and reduce energy consumption. Moisture control is an important part of granulation production, which affects the strength and particle size of granulated particles, which determines the breathability of the raw material layer. In order to improve the control level of adding water in pelletizing production, the article makes a research on the application of wet capacity in iron ore sintering. Material wet capacity refers to the unit of mass of drying materials at a certain temperature and pressure can accommodate the maximum moisture content. Laboratory tests and industrial tests show that: ① The water absorption process of the material is significant, and the wet capacity is an important parameter of the water absorption; ② The wet capacity is linear with the appropriate water content of the material granulation, the correlation coefficient R = 93.1%; ③ Through the material CaO, Al2O3, MgO, <0.2mm particle size content and 0.2 ~ 0.7mm particle size content and other physical and chemical indicators to predict the wet capacity. In order to improve the prediction of wet capacity, the influence of physical properties such as specific surface area, porosity and contact angle must also be considered.